Yes, Nokia 7 Plus in-the-box accessories include a pair of an earphone as well.
No. Despite a bigger battery and the Aluminium Alloy body, Nokia 7 Plus does not have any abnormal heating issues.
No. Nokia 7 Plus does not have a dedicated memory card slot. It has a hybrid sim slot. So, you can use a MicroSD card and a sim card at one go.
Yes, Nokia 7 Plus does have the dual VoLTE support.
Great battery life, immersive display, solid design, and software at its purest, that's the Nokia 7 Plus for you.